Welcome to the forum. I'll give you my opinion but as you know, forums like this will have folks giving a variety of opinions and you'll have to weigh what each person says and come up with your own conclusion.
I'm one who wants to do everything I can in order to pull 4-down. I'd research a driveline disconnect as opposed to a lube pump but I'm thinking either will be costly. I'm sure others will chime in as to the cost and feasibility of each.
With a tow dolly, you'd still need a driveshaft disconnect and a dolly to buy and then to contend with --and a trailer is expensive too, adds weight, and you have to find a place to store it when at a campsite or RV park.
Or, trade the 4x2 for a 4x4 Silverado that in most cases can be towed 4-down without modification.
eta: most are using a Superior Drive Shaft Disconnect as Remco itself is no longer marketing the disconnect and I believe are only selling lube pumps now.
Go here for information on the Superior Drive Shaft Disconnect